Hi,we figured out the same error (HTTP 403) on some XP/IE8 systems with ASA 5512-X/5515-X and OS 9.1.2; on XP/Win7 with IE9/10 activating usage of TLS V1 in IE Settings or changing the SSL version to negotiate as server on the ASA fixed the problem.T...

Hi,you have to install the certificate into the local machine certificate store otherwise AC isn't able to use it before the User has logged in.In our Environment SBL works well with Windows XP/ 7 and cert auth!Sent from Cisco Technical Support iPhon...